modules: Drop IssueTracker.SelectActiveStoryIds

Not needed right now, let's implement it properly when we need it.

Change-Id: 1e6a19144d
pivotal: Comment out old code

Comment out the code that is old and needs to be updated. Panics were
put to the places to make sure the old implementation is never used and
SalsaFlow panics to signal the implementation is missing.

Change-Id: e07effcebf
pivotaltracker: Don't use gopkg.in for PT module

No need really since the library is absolutely not stable yet.

Change-Id: e1d5ad0455
repo bootstrap: Add pivotal_tracker support

Add the Pivotal Tracker section into the local configuration file
template.

Change-Id: c9f76650f7
wip [ci skip]

Change-Id: db6da78d85